KROHNE DW 181-182-183-184 EN - Manual (Page 13)

Installation and operating instructions DW 181 - 184 13
4 Display
4.1 Local Flow indication
Indicator “G”
Indicator “A”
All flow switches can be equipped with
indicator G. Scale marks are from 1 to 10 to
allow visual control of the flow rate. The
switching point may be changed as and when
required.
The DW 181, DW 182 and DW 183 flow
switches up to meter size DN100 (4”) can be
supplied with indicator A. The dial is marked in
flow units (e.g. l/h, m³/h) to provide more
accurate flow readings. The switching points are
factory marked on the dial. With this indicator it
is also possible to adjust the switching points at
non-flowing conditions.
High-temperature versions are supplied without a local indicator.
4.2 Limit Switches
Every flow switch can be equipped with either one or two limit switches which can be adjusted over
the entire measurement range.
Limit switch specifications
Type and number of switches
Switch rating
Standard
K1(K2) single (twin for K2) bi-stable limit switch
14VA max. (max. 350 V AC, max. 0.4 A)
reed type IA42 ATF 15-45
EExi safety values Ii < 500mA, Ci = 0 nF, Li = 0 µH
With change over
K1(K2) single (twin for K2) bi-stable limit switch 3 VA max. (max. 28 V DC, max. 0.25 A)
type reed CM21…
EExi safety values Ii< 500 mA, Ci= 0 nF, Li= 0 µH
With relay
KV1 (KV2) 2000 VA max. (max. 250 V AC, max. 8 A)
Power supply: 240/110/48/24 V AC (50/60 Hz)
110/48/24 V DC
relay type Finder
Response time: 5…12ms
EEx d values See section 4.3: EEx d version
High-temperature version (non-EEx)
single bi-stable limit switch 18 VA max. (max. 220 V, max. 0.8 A)
reed type IA13….
The switch ratings are given for standard resistance loads. Make sure you use the correct
protection circuits when using other types of load (e.g. inductive).